Question

我需要从outlook addin（c＃+ vsto）中调用outlook的会话清理。我在办公室功能区栏上有我的按钮，点击它后，需要在当前选择的邮件项目上调用outlook的对话清理。这是可能的，如何去做？

Answer 1

Outlook项目提供GetConversation方法，该方法获取表示此项目所属对话的Conversation对象。

如果项目没有对话，

GetConversation将返回Null（在Visual Basic中为Nothing）。在以下情况下，项目不存在对话：

•项目尚未保存。可以通过编程，用户操作或自动保存来保存项目。

•对于可以发送的项目（例如，邮件项目，约会项目或联系项目），该项目尚未发送。

•已通过Windows注册表禁用了对话。

•商店不支持“对话”视图（例如，Outlook在Microsoft Exchange Server 2010之前的Microsoft Exchange版本的经典在线模式下运行）。使用Store对象的IsConversationEnabled属性来确定商店是否支持“对话”视图。

以下代码示例假定资源管理器窗口中的所选项目是邮件项目。代码示例获取与所选邮件项关联的对话，并枚举该对话中的每个项目，显示该项目的主题。 DemoConversation方法调用所选邮件项的GetConversation方法以获取关联的Conversation对象。 DemoConversation然后调用Conversation对象的GetTable和GetRootItems方法分别获取Table对象和SimpleItems集合。

void DemoConversation() 
{ 
   object selectedItem = 
    Application.ActiveExplorer().Selection[1]; 
   // This example uses only 
   // MailItem. Other item types such as 
   // MeetingItem and PostItem can participate 
   // in the conversation. 
   if (selectedItem is Outlook.MailItem) 
   { 
      // Cast selectedItem to MailItem. 
      Outlook.MailItem mailItem = 
          selectedItem as Outlook.MailItem; 
      // Determine the store of the mail item. 
      Outlook.Folder folder = mailItem.Parent as Outlook.Folder; 
      Outlook.Store store = folder.Store; 
      if (store.IsConversationEnabled == true) 
      { 
         // Obtain a Conversation object. 
         Outlook.Conversation conv = mailItem.GetConversation(); 
         // Check for null Conversation. 
         if (conv != null) 
         { 
             // Obtain Table that contains rows 
             // for each item in the conversation. 
             Outlook.Table table = conv.GetTable(); 
             Debug.WriteLine("Conversation Items Count: " + 
             table.GetRowCount().ToString()); 
             Debug.WriteLine("Conversation Items from Table:"); 
             while (!table.EndOfTable) 
             { 
                 Outlook.Row nextRow = table.GetNextRow(); 
                 Debug.WriteLine(nextRow["Subject"] 
                 + " Modified: " 
                 + nextRow["LastModificationTime"]); 
             } 
             Debug.WriteLine("Conversation Items from Root:"); 
             // Obtain root items and enumerate the conversation. 
             Outlook.SimpleItems simpleItems 
              = conv.GetRootItems(); 
             foreach (object item in simpleItems) 
             { 
                 // In this example, only enumerate MailItem type. 
                 // Other types such as PostItem or MeetingItem 
                 // can appear in the conversation. 
                 if (item is Outlook.MailItem) 
                 { 
                     Outlook.MailItem mail = item 
                      as Outlook.MailItem; 
                     Outlook.Folder inFolder = 
                      mail.Parent as Outlook.Folder; 
                     string msg = mail.Subject 
                     + " in folder " + inFolder.Name; 
                     Debug.WriteLine(msg); 
                 } 
                 // Call EnumerateConversation 
                 // to access child nodes of root items. 
                 EnumerateConversation(item, conv); 
              } 
           } 
        } 
     } 
  } 


  void EnumerateConversation(object item, 
        Outlook.Conversation conversation) 
  { 
       Outlook.SimpleItems items = 
            conversation.GetChildren(item); 
       if (items.Count > 0) 
       { 
          foreach (object myItem in items) 
          { 
              // In this example, only enumerate MailItem type. 
              // Other types such as PostItem or MeetingItem 
              // can appear in the conversation. 
              if (myItem is Outlook.MailItem) 
              { 
                  Outlook.MailItem mailItem = 
                    myItem as Outlook.MailItem; 
                  Outlook.Folder inFolder = 
                    mailItem.Parent as Outlook.Folder; 
                  string msg = mailItem.Subject 
                  + " in folder " + inFolder.Name; 
                  Debug.WriteLine(msg); 
               } 
               // Continue recursion. 
               EnumerateConversation(myItem, conversation); 
            } 
         } 
      }

从outlook加载项调用会话清理

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